Lenny Valentino was a Polish supergroup formed in 1998 in Mysłowice by Myslovitz frontman Artur Rojek and Negatyw lead singer Mietall Waluś. Joined by musicians of Polish alternative rock band Ścianka, Lenny Valentino recorded and released their first and only album 'Uwaga! Jedzie tramwaj' in 2001. After a series of concerts around Poland, the band went on hiatus.
In September 2006 they reunioned and played one show during Off Festival in Mysłowice. Macio Moretti played the drums instead of Arkadiusz Kowalczyk, who was sick. About 10,000 people took part in this special event.